Just so you know, you can use another racer's tune in the Time Trials then save it to use on your own car at a later date. Run the TT for a few laps and F1 2016 will come up with various ghosts that match your time, more or less, as you get faster. Beat one ghost and move on. Once you get a good and unbeatable ghost, you can use that tune on your own car. Save it for later, then you can check out the differences between the stock settings and the setting on the tune you've saved.
Now, some cars are not tuned so this won't help much. Some are, so look when you get back to your settings screen. I'll do a video on this next week if I have time. That will explain it all.